Copyholder



COPYHOLDER July. 16, 19.57 D. T. BL-ATHERWICK Fid Feb. 2e, 1954 @agile/1 D. T. BLATHERwlcK ,July 16, 1957.

COPYHOLDER 6 Sheets-Sheet 2 Filed Feb. 26, 1954 a: gdm

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July 16, 1957 D. T. BILA'YrHERwlK 2,799,204

COPYHOLDER 6 Sheets-Sheet 3 Filed F. 2.6, 1954 `[uly 16, 1957l D. T. BLATHERwlcK l2,799,204

" coPYHoLDER Filed Feb. 2e, 1954 'e sheets-sheet e' United States ,Patent O COPYHOLDER Delbert T. Blatherwick, Chicago, Ill., assignor to Robertson Photo-Mechanix, Inc., a corporation of lilinois Application February 26, 1954, Serial No. 412,918 Claims. (Cl. Sil-24) This invention relates to a copyholder for use with photographic equipment of large size, and particularly for use in the graphic arts. The copyholder embody-ing the present invention is convenient to use and economical to manufacture.

Copyholders of the type to which this invention pertains are customarily used in connection with two general types of copy to be photographed. One type consists of opaque material which is to be photographed by light reflected from the material. Thus, for example, conventional pictures or written or printed matter, art work on paperboard or canvas, and other material constitute the general run of opaque material to be handled. The other type of material to be handled is generally transparent or translucent and is photographed by transmitted light. Such copy is generally designated as transparencies.

The copyholder embodying the present invention consists of a generally at construction having a number of frames therein, said construction being pivotally secured on a horizontal axis. Copyholders to which this invention pertains are generally used in a vertical position and are so constructed that the copyholder may be disposed in a horizontal position for loading opaque copy. Transparencies may be loaded in the copyholder while the latter is in vertical position.

The copyholder of the present invention permits both types of copy, opaque or a transparency, to be firmly and accurately retained in position for copying, at the will of the operator. It is also advantageous because of the mechanical simplicity of the parts, this tending to reduce manufacturing and assembly costs, as well as making the structure rugged and foolproof. Other advantages will occur to those skilled in the art in connection with the description of the copyholder.

In order that the invention may be fully understood, reference will now be made to the drawings wherein an exemplary embodiment of the invention is illustrated, it being understood that variations may be made without departing from the scope of the invention except as defined by the appended claims.

Figure 1 is a front view of the copyholder embodying the present invention, the tracks upon which the copyholder is supported being shown in section.

Fig. 2 is a side elevation of the copyholder illustrated in Fig. 1, the copyholder being in a normally vertical position. The dotted lines show the horizontal position to which the copyholder may be swung.

- Fig. 3 is a rear elevation of the copyholder illustrating the masking curtains for use in connection with a tra-nsparency.

Fig. 4 is a perspective detail of a portion of the rear of the copyholder illustrating the transparency retaining means.

Fig. 5 is a detail partly in section taken on line 5--5 of Fig. 2 and illustrating the detent and stop means for the copyholder when the same is in the horizontal position.

FCC

Fig. 6 is a perspective View of a portion of the supporting and locating means to be used in connection with a transparency.

Fig. 7 is an elevation of the copyholder in the horizontal position with the auxiliary frame in open position, the dotted lines illustrating the normally vertical position of the copyholder.

Fig. 8 is an enlarged detail partly in section of the copyholder in the position illustrated in Fig. 7.

Fig. 9 is a sectional detail on line 9-9 of Fig. 8, partly broken away.

Fig. 10 is an enlarged sectional detail of the index means at each end of the glass transparency supporting bars.

Fig. l1 is a perspective detail of the locking means for the rocker arm having the fingers for supporting the glass transparency.

Fig. l2 is a section along line 12-12 of Fig. 3.

Fig. 13 is a section along line 13-13 of Fig. 3.

Fig. 14 is a perspective of one of the angle support members used in positioning with the glass transparency.

Fig. l5 is a front elevation of the copyholder with certain parts broken away to illustrate the interior.

Fig. 16 is a front elevation of the copyholder with the backing or copyboard removed and illustrated still different parts thereof.

Fig. 17 is a diagrammatic illustration showing the cord and pulley connections between the vertically movable masking curtains so that they may both move simultaneously.

The copyholder is supported on a suitable bed including rails 10 and 11. The bed may have any desired construction and in accordance with usual practice supports a camera at one end thereof. The copyholder embodying the present invention is supported on rollers riding on the rails of the bed in such a way that the copyholder may be moved to any predetermined position along the bed with respect to the camera. inasmuch as the details of the bed and camera form no part of the present invention, no showing thereof is made.

Resting upon the bed is a generally U-shaped support, generally indicated by 15, the support having bottom portion 16 extending transversely across the bed and having vertically extending brackets 17 and 18 respectively. The free ends of support brackets 17 and 18 are provided with trunnion bearings 19 and 2t) for pivotally supporting the copyholder proper.

The copyholder proper 4includes main frame 24 and cooperating hinged auxiliary frame 25. For convenience, frame 24 will be referred to as the main copyholder frame while frame Z5 will be referred to as the auxiliary frame. It is understood, of course, that with respect to support 15, main frame 24 is removable therefrom.

Main copyholder frame 24 may be formed of steel, aluminum, wood or other suitable materials. Main frame 24 has a marginal trough-shaped portion, generally indicated by 26 and consisting of bottom portion 27 and outer land inner side walls 28 and 29. Outer wall 28 has free edge 30 finished or machined so that all the free edges of main frame 24 lie in substantially one plane. As will be more readily appreciated after the copyholder has been fully described, it is not necessary that all free edges 30 of the main frame lie in one plane. However, the manufacture and assembly of the copyholder is facilitated by this provision.

Inner wall 29 carries on the side remote from wall 28 generally flat panel 32. Flat panel 32 is generally parallel to and is intermediate the planes determined by bottom trough portion 27 and the plane determined by free edges 30 and is cut out to leave large window 33.

Hingedly secured along one side of main frame 24,

preferably at a side which is vertical in the upright position of the copyholder, is auxiliary frame Both frames 24 and 25 are generally rectangular in plan outline. While the hinge axis of auxiliary frame 25 may lie along any one of the four sides of frame 24, it is preferred to have the hinge axis extend along one of the frame sides perpendicular to the trunnion axis extending between the free ends of support brackets 17 and 18.

Auxiliary frame 25 has outer trough-shaped peripheral portion 35. Trough-shaped portion has free edge 36 finished. At the hinged side of auxiliary frame 25, hinges 38 are provided along the two cooperating frame edge portions. Trough-shaped portion 35 and corresponding trough-shaped portion 26 of the two frames are opposite each other and in reversed positions when the two frame portions are in closed position. Trough-shaped portion 35 of auxiliary frame 25 has inner wall portion 41, the free edges 42 of which lie in one plane. Glass plate 44 rests upon free edges 42 of the auxiliary frame, and is held in position by molding 45.

Auxiliary frame 25 and main frame 24 are provided with counter balancing means so that auxiliary frame 25 may be left in any desired open position without danger of the auxiliary frame changing its position. The copyholder is normally to be opened only when it is in horizontal position, although the construction is sufficiently stable so that it may be opened or closed in any desired position of the copyholder. The counterbalancing means may be disposed on one or both sides of the copyholder adjacent to the hinged side. Such means comprise spaced parallel arms 47 and 4S pivotally secured at one end in the trough of main frame 24 as by pivot bolt 49. The free ends of arms 47 and 48 carry roller 50 mounted upon pivot pin 51. Rollers 50 are adapted to ride along the bottoms of trough-shaped portions 35 of auxiliary frame 25 at the sides adjoining the hinged side. Arms 47 and 48 also support links 52, each link having secured thereto one end of coil spring 53, the other end of which is anchored to a suitable hook carried by the outer wall of peripheral trough-shaped portion 35 of the auxiliary frame. This mechanism for counterbalancing the auxiliary frame 25 is contained within the trough-like marginal portions of frames 24 and 25 when in closed position.

Auxiliary frame 25 has side 54 opposite the hinged side of the auxiliary frame. Side 54 of the auxiliary frame carries handles 55.

Releasable latch means are provided for locking the auxiliary frame to the main frame. A pair of such latch means are provided, each including a hook 56 carried by side 54 of the auxiliary frame. Each hook 56 is suitably shaped to cooperate with a latch bar 57 having a latch pin 58. Each latch bar 57 is pivotally secured at 60 to a bracket 61 carried by main frame 24 within troughshaped portion 26. Springs 62 are disposed within trougi shaped portion 26 and have one end anchored to the inner side portion 29 of trough 26 while the other end bears against latch bars 57, urging the same into locking position. Release pins 64 are pivotally secured to latch bars 57 and extend through the side of frame 24. Release pins 64 are accessible in the vertical or horizontal position of the copyholder.

The copyholder is provided with means to releasably retain it in its horizontal and vertical positions. To retain the copyholder in its vertical position, spring ball and socket means generally indicated by 65 are provided, such means consisting of cooperating ball and socket members mounted respectively on part 16 of the support and on main frame 24. The cooperating ball and socket members are designed so that the copyholder can be turned on its trunnion axis to the desired vertical position, the copyholder thereafter being retained in said vertical position and being prevented from travel beyond said vertical position.

` frame.

In order to limit the travel of the copyholder in the horizontal position, support bracket 18 is provided with part 66 suitably apertured and tapped to accommodate stop bolt 67. Stop bolt 67 extends vertically and the tlat head of the bolt may be adjusted to any desired height by turning the bolt and locking the same with a suitable lock nut. The flat head of bolt 67 is engaged by tne main Support bracket 18 also carries longitudinally movable detent pin 70 having pointed tip 71 adapted to engage a conical recess in the side of the main frame when the copyholder is turned to its horizontal position. Detent pin 70 is spring pressed to move the pointed tip inwardly of the bracket. It is understood that stop bolt 67 is so adjusted as to limit the travel of the copyholder to the horizontal position where detent pin 70 will engage the copyholder frame to maintain the same locked in horizontal position. To release the copyholder, pin 70 is retracted so that the pointed tip clears the copyholder frame.

Between main frame 24 and auxiliary frame 25 is the cushion or oating frame which serves as the copy board holder. Frame 75 has bottom panel 76 and sides 77 extending toward auxiliary frame 25. Removably disposed within frame 75 is rigid copy board 80 of wood or other suitable material. Copy board holder 75 has a generally rectangular outline, and has a large window 81 cut out of the bottom, the size of the window being large enough to accommodate the maximum transparency framed by the masking shades to be described later.

The copy board holder is supported on panel 32 of the main frame by a combination of coil and leaf springs. Thus four leaf springs 82 are provided, one near each of the four sides of the copy board holder and substantially parallel to the adjacent side of the copy board holder. Each leaf spring has its two ends rigidly attached to the main frame and floating frame respectively. In addition coil springs 84 are provided, these springs being attached to parallel channels 85 rigidly attached to frame bottom 76 adjacent the top and bottom margins of window 81 in the vertical position of the copyholder.

The leaf springs 82 and the coil springs 84 thus tend to force the frame or copy board holder 75 upwardly with respect to the main frame 24 and toward the hinged auxiliary frame 25. When the copy board 80 is mounted on the copy board holder 75 it, and any copy carried upon it, is rmly held against the glass plate 44. The copy board is provided with markings in the customary manner to aid in positioning copy upon it. When a transparency is to be used, copy board 80 is removed and means are provided for supporting and masking the transparency back of the opening or window 81 inthe copy board holder 75, as more fully hereinafter described.

Attached to the panel 32 of main frame 24 at regions 91 to 94, inclusive, are rigid support bars 96 and 97. These bars are back of copy board holder 75 and extend parallel to each other and generally perpendicular to the trunnion axis. However, these bars may also extend parallel to the trunnion axis rather than as illustrated. Bars 96 and 97 lie generally near and outside the edges of window 33 of panel 32, and are rigidly attached to portion 32 of the main frame as by bolts or any other suitable means. Bars 96 and 97 are similar and are each provided with a series of recesses or notches 98 disposed at regular intervals. The notchesV extend from an inner edge portion of each bar toward the center portion thereof. Bars 96 and 97 are supported at their ends to clear panel 32.

Near each end, on its outer narrow edge 99, bar 96 carries brackets 100. Brackets 100 are arranged to support spring roller curtain 101 having draw edge 102. Bar 97 is similarly arranged to have its own corresponding spring roller draw curtain, corresponding parts'being provided with the same numbers, primed.

Near its ends bar 96 also carries on its broad face 104` the brackets 105. Bar 97 carries similar brackets at the two ends thereof, these two sets of brackets accommodating draw curtains 107 and 107 respectively.- As illustrated in Fig. 17, draw shades 107 and 107' move together in a manner similar to draw drapes. Suitable cords and pulleys are provided for this purpose as hereinafter set forth, the cords being attached to the draw edges of the shades.

Referring back to curtains 101 and 101', draw edges 102 and 102 have rods 109 and 109 extending therethrough and these rods carry spring saddles 110 and 110' respectively at their ends. Spring saddles 110 and 110 ride at bars 111 and 112 extending between bars 96 and 97 at the top and bottom respectively of the window formed in the main frame. These saddles provide friction retention of the draw shades in any desired position. Finger pieces 113 and 114 permit manual adjustment of the two curtains, which are independently adjustable.

Curtains 107 and 107 have their respective draw edgesv attached to framing bars 120 and 120' respectively. Since the framing bars are similar, only one will be described in detail. Referring specifically to Figs. 3, 4, 6, 10, 11 and 14, bar 120 extends between bars 96 and 97 and has end portions 121 (Fig. l0) disposed on the inside faces of bars 96 and 97. Bar 120 carries at each end index block 122 rigidly attached thereto and extending over the outside face of bars 96 and 97. Block 122 is apertured and tapped to accommodate index ball 123, spring 124 and adjusting screw 125. Ball 123 is adapted to project into the notches in the corresponding bar 96 or 97 for index purposes. Spring 124 will yield sufficiently to permit the index blocks to be forcibly moved along bars 96 and 97.

A cord and pulley arrangement is provided for moving thev curtains 107 and 107 together and symmetrically. For simplification, this cord and pulley arrangement is shown in Fig. 17. The cord 170 forms in effectl a continuous belt passing from its point of attachment 171 on one end of bar 120 around pulley 172, then to its point of attachment to the same end of bar 120', then around pulleys 173 and 174 to its point of attachment 175 at the other end of rod 120, then around pulley 176 to its point of attachment 177 to the corresponding end of bar 120', and thence around pulleys 178 and 179 back to its point of attachment 171 on bar 120. It will be apparent that on movement of either bar 120 or 120', the other bar will move an equal distance in the opposite direction.

It is understood that the cord and pulley connection between curtains 107 and 107 will be sufficiently sturdy so that adjustment of bar 120, for example, will -suiice to cause bar 120 to move correspondingly. In practice, bolt head 125 at each end of bar 120 may be used as a handle to move bar 120 up or down (assuming that the copyholder is in a vertical position), as desired.

Bar 120 has top edge 127 facing bar 120. Bar 120' has a corresponding edge. Edge 127 is wide enough to accommodate a photographic plate 128 or other transparency to be copied. The transparency 128 rests upon edge 127. Bar 120' also has back support 130 which is a narrow strip of metal offset from bar 120 as illustrated in Fig. 4. The offset is inwardly of the copyholder from bar 120.

Bar 120' rotatably supports rocker 132 in blocks 133 to 135, inclusive. Rocker 132 carries a number of fingers 137 having tips 138 which may engage the adjacent face of plate 128 when the rocker is in the position illustrated in Fig. 4. Rocker rod 132 is mounted to turn through about 90 and has springs 138 disposed between sleeves on the rocker and stationary parts of blocks 133 and 135, as hereinafter described, so that when the rocker is in the position illustrated in Fig. 4, the springs will urge ngers 137 and tips 138 against the surface of plate 128. Handles 140 at the ends of rocker 132 may be used to operate the rocker. The rocker is indexed to the oi position shown in Fig. 6 by slot 141 in ,blocli 135 cooperating with projection 142 on a sleeve 143 on rocker rod 132. Spring. 144 extending between sleeve 143 and shoulder 146rigidly secured to rod 132 permits sleeve 143 to move axially when projection 142 is clear of slot 141.v Handle 140 is used to move rocker rod 132 lengthwise to unlock the rocker and permit the same to be turned to bring. the fingers 137 in contact with the plate or transparency 128.

Bar 120 has a number of recesses 151 disposed at regular intervals near edge 127, as illustrated in Fig. 6. These recesses may be spaced at uniform intervals of 1", for example, and are used as locating'recesses for support and guide members. As illustrated in Fig; 6, for example, support and guide member 153 has pin portion 154 which is adapted to enter one of the recesses in bar 120. Support member 153 also has finger 155 which is adapted to rest upon edge 127 and function as a support for the bottom edge of plate or transparency 128. As many of support members 153 may be provided as are necessary.

At one corner of plate 128, the support and guide members are in the form of angles for supporting and positioning the bottom and side edges of transparency 128. This support member is illustrated in Fig. 14 and comprises angular body 157 having pin 158 for disposing the support member in a recess in bar 120. Support member 157 has pin 159 which corresponds to pin 155 in the support member previously described and is adapted to support the bottom edge of plate 128. Support member` 157 also has pin 160 disposed at the end of the support member and adapted to lie against one of the vertical edges of plate 128. By suitably positioning the angular support member 157 on bar 120', the position of the transparency 128 is fixed.

It is understood that bar 120 is similarly provided with support members 153 so that the top and bottom edgesV of plate 128 are supported by rounded pins.

In using the copyholder, it is swung into the horizontal position as illustrated, for example, in Fig. 7. 'The catch for the auxiliary frame is released and the auxiliary frame is opened. When opaque copy is to be'photographed, it is disposed on copy board 80. The copy should be properly centered and this may be done by means of the scale on the board, illustrated in Fig. 1.' The floating copy board holder in which the board is retained rises a limited distance when the auxiliary panel is opened, this being shown in Fig. 8. The copy may be attached to the board in any suitable fashion, or the copy may be loose on the board. When the auxiliary `frame is yclosed down upon the main frame, the glass panel carried by the auxiliary frame will engage the pictureor board or both and force the boardinto the main frame against the force of the various coil and leaf springs.

The copy surface is thus held in close contact with the glass panel 44. The auxiliary frame itself is limited in closing, the latch locking the auxiliary frame in position so the spring mounting of the oating frame maintains the entire copy tightly in the plane of thek inner surface of glass plate 44.

With the copyholder closed, the copyholder may be swung to the vertical position and moved along the bed so that the picture to be photographed is in the desired focal plane. i

In case a transparency is to be copied, board is removed from the copyholder while in horizontal position. The copyholder is now swung to its vertical position in order to load the same with the glass plate. As illustrated in Fig. 6, for example, the rocker rod having the ngers for retaining the transparency is moved to an inoperative position at both the top and bottom of the window in the copyholder. The transparency may now be located in the desired position as illustrated in Fig. 6, by means of the various support members 153 and 157. The cross bars and 120 for supporting the transparency at the top and bottom thereof are adjusted so that the spacing between the same is correct. In practice, the transparency that the transparency containing the picture to be printed or copied is at a desired distance from the camera. The transparency is opposite the window or opening 81 in the copy board holder 75, and may be illuminated from the rear. The transparency maybe removed by reversing the above procedure, the positioning and removal of the transparency being suitably accomplished while the copyholder is in vertical position. It will be noted that when board 80 is removed, the oating frame for the board will rise or move toward the glass panel 44 carried by the auxiliary frame, and assuming that the copyholder is in the closed position, the glass panel will limit the movement of the floating frame.

I claim:

1. A copyholder for process camera work comprising a main frame of generally rectangular shape, said frame having a panel shaped to provide a window opening, manually adjustable shades carried by said panel and movable to reduce the Window opening, a pair of hori-` zontal bars, means for supporting said bars with respect to said main frame so that said bars are movable vertically, shades having draw edges attached to said bars, means on at least the bottom bar for providing a ledge for supporting the bottom edge of a transparency, a rocker rod pivotally secured to said bottom bar, fingers carried by said rocker rod for engaging an edge portion of said' transparency for retaining the same in positionV against said ledge, a resiliently mounted copy board holder carried by said main frame panel on the side opposite to said spring fingers, said copy board holder being shaped to provide a window opening in substantial registry with the main frame window opening and being movable generally along a line perpendicular to the plane of the main frame panel, a copy board carried by said copy board holder and readily removable therefrom, and means including a glass window hingedly secured to said main frame to form a cover therefor, said means being adapted to be opened to expose said copy board and opaque copy carried thereby, and to be retained tightly against said board and copy when said means is closed against said main frame, said glass window engaging said copy board to force the board and copy board holder against its spring mounting toward the panel of the main frame, said copy board when removed providing free passage of light through said glass window and the registering window openings of the copy board holder and the main frame for the copying of a transparency, the means for supporting the pair of horizontal bars including two vertical bars with alined notches, said horizontal bars having yoke means for riding upon said vertical bars, index means carried by said horizontal bars for cooperation with the notches in said vertical bars, and index means for locking said rocker rod in an operative position where the fingers engage the transparency plate, or in an inoperative position where the fingers are clear of said main frame and do not engage the transparency.

2. A copyholder according to claim 1 wherein the means for resiliently supporting said copy board holder include leaf springs and coil springs, said leaf springs extending along the major portion of each dimension of the floating frame adjacent the edge thereof, four leaf springs being provided along the four sides of said tioating frame, and the coil springs are disposed at spaced points in parallelism on opposite sides of said copy board holder.

3. A ,copyholder for use with av processcamera, said copyholder comprising main and auxiliary frames, hinges for securing said two frames 'along one side of each of said frames, said two frames having generally rectangular outlines and each having a peripheral trough shaped portion, said two trough shaped portions facing each other, latch means for locking said two frames together in a closed position with the opposing edges of the frame spaced from each other, spring loaded means normally disposed between said main frame and auxiliary frame for stabilizing said auxiliary frame in open position, said spring loaded means including rollers operating in the trough of the auxiliary frame and including arms pivotally secured in the trough of the main frame, said aux-y iliary frame dening a window opening and carrying a glass plate to form a transparent window, said main frame having a panel with a window opening in substantial reg istry with the auxiliary frame window in the closed po`sition of the copyholder, movable curtains carried within said main frame for reducing the effective window opening in said main frame, means carried by said main frame for supporting a transparency in said window, avoating copyboard holder carried by said main frame and disposed between said main frame and the auxiliary frame glass window, said copy board holder frame also having a window in registry with the other two windows, a copy board normally resting on said main frame to provide a backing for opaque copy, said main frame having resilient mounting means urging said copy board holder holder outwardly from the main frame toward the auxiliary frame and for pressing said copy board against the glass plate carried by the auxiliary frame, said copy board being removable to permit passage of light through the auxiliary frame and main frame and any transparency carried thereby.

4. A copyholder for process camera work comprising a main frame of generally rectangular shape, said frame having a panel shaped to provide a window opening, manually adjustable shades carried by said panel and movable to reduce the window opening, said shades being at the sides of said window opening in the vertical position of the copyholder and being horizontally movable, a pair of horizontal bars, means for supporting said bars with respect to said main frame so that said bars are movable vertically, shades having draw edges attached to said bars, means on at least the bottom bar for providing a ledge for supporting the bottom edge of a transparency, said bottom horizontal bar being provided with a series of regularly spaced apertures, glass supporting fixtures, each fixture having a pin for engaging at least one of said apertures in said bar and having another pin overlying a part of said bar to provide a rounded surface upon which the bottom edge of the glass plate may rest, a rocker rod pivotally secured to said bottom bar, fingers carried by said rocker rod for engaging the edge portion of such transparency for retaining the same against said ledge, index means for locking said rocker rod in an operative position where the fingers engage the transparency plate, or an inoperative position where the fingers are clear of said main frame and do not engage the transparency plate, a resiliently mounted copy board holder carried by said main frame panel on the side opposite to said spring fingers, said copy board holder being shaped to provide a window opening in substantial registry with the main frame window opening and being movable generally along a line perpendicular to the plane of the main frame panel, a copy board carried by said iloating frame and readily removable therefrom, and means including a glass window hingedly secured to said main frame to form a cover therefor, said means being adapted to be opened to expose said copy board and opaque copy carried thereby, and to be retained tightly against said board and copy when said means is closed against said main frame, said glass window engaging said copy board to force the board and oating frame against its spring mounting toward the panel of the main frame, said copy board when removed providing free passage of light through said glass window and the registering window openings of the copy board holder and the main frame for the copying of a transparency, the means for supporting the pair of horizontal bars including two vertical bars with alined notches, said bottom horizontal bars having yoke means for riding upon each of said vertical bars, and index means carried by said horizontal bars for cooperation with the notches in said vertical bars.

5. A copyholder for process camera work comprising a main frame of generally rectangular shape, said frame having a panel shaped to provide a window opening, a pair of horizontal bars, means for supporting said horizontal bars spaced from each other and at selected positions within said copyholder, opposing faces of said horizontal bars being provided with projecting members to be contacted by a transparency positioned between said horizontal bars, at least the bottom horizontal bar of said pair of horizontal bars carrying a rocker rod pivot ally secured thereto, said rocker rod carrying ngers for engaging a transparency and being spring pressed thereagainst, index means for rocking said rocker rod into an operative position in which the fingers engage the transparency or into an inoperative position where the fingers are moved away from and do not engage the transparency, at least the bottom horizontal bar of said pair of horizontal bars having a series of regularly spaced apertures, and a plurality of glass supporting fixtures, each fixture having a pin for engaging at least one of said apertures in said bar and having another pin overlying a part of said bar to provide a rounded surface upon which the bottom edge of a glass plate may rest.

Referente-es Cited in the tile of this patent UNITED STATES PATENTS 1,141,704 French June 1, 1915 1,171,772 Cornwall Feb. 15, 1916 1,214,132 Carleton Jan. 30, 1917 1,813,689 Weisker July 7, 1931 1,814,390 Johnson .uly 14, 1931 1,999,616 Peterson April 30, 1935 2,512,182 Sussin June 20, 1950 2,562,312 Gregory July 31, 1951 2,653,509 Nineberg Sept. 29, 1953 

